论文部分内容阅读
本文建立了山岭隧道衬砌背后空洞影响数值计算模型,并对水平侧压力系数不同时空洞对二次衬砌结构变形和内力的影响进行分析,研究结果表明:水平侧压力系数不同时,隧道衬砌结构的变形差异较大;水平侧压力系数不同时,弯矩的变化比轴力的变化更为明显,但水平侧压力系数的增加会导致轴力和弯矩都迅速增加;拱腰衬砌对拱顶空洞的产生是非常敏感的,尤其是当侧压力系数较大时,拱腰处的弯矩甚至会发生符号的改变;仰拱部位的衬砌结构在空洞产生后,随着侧压力系数的增加仰拱部位衬砌结构所受到的弯矩减小,但随着侧压力系数的增大,仰拱所受到的轴力大大增加,有可能产生压溃破坏。
In this paper, the numerical model of the influence of the tunnel tunnel lining on the mountainous tunnel is established, and the influence of different horizontal and lateral pressure coefficients on the deformation and internal force of the secondary lining is analyzed. The results show that when the lateral pressure coefficient is different, The variation of the deformation is larger; when the horizontal pressure coefficient is different, the change of bending moment is more obvious than that of the axial force, but the increase of the horizontal pressure coefficient will lead to the rapid increase of axial force and bending moment; Is very sensitive, especially when the lateral pressure coefficient is large, the bending moment at the arch waist can even change sign. The lining structure of the inverted arch part after the cavity is generated, with the increase of the lateral pressure coefficient, The bending moment of the lining structure decreases, but as the lateral pressure coefficient increases, the axial force on the inverted arch greatly increases, which may cause crushing failure.